jennifer ashton is here to run this down for us. good morning. >> good morning, maggie. >> first in the interest of full disclosure you are an investor on the advisory board of a sports drink, exactly the kind of the study. things sugar has been added, soda, juice that's not all juice and sports drinks. >> first we have to ask why they did the study. as we know, because we hear about it all the time, obesity is such an enormous problem in our teenagers, in our children so they really sought to figure out why. once you isolate factors individually, hopefully you can target the treatment and reduce those behaviors that may be playing a role. obviously we can't do anything about our genetics or family history. that's why we did the study, they wanted to look at specifics. how much are they drinking, how much of it, what else are they eating and doing. >> they found you don't have to drink very much to gain a significant amount of weight. one 15 ounce could mean. >> 15 pounds or more a year. that is a staggering fact. let's talk about w